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- Thapa, R. S. 1971. Results of preliminary investigation on black stains in commercial trees in dipterocarp forest of Sabah . Malayan Forester 34:53-58.
- Thapa, R. S., and P. Singh. 1986. Large-scale mortality of deodar tree by the bark borer, Scolytus major Stebbing (Scolytidae, Coleoptera) in Kulu Forest Division, Himachal Pradesh . Indian Forester 112:392-398.
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- Thapa, R., and P. Singh. 1990. Insect borers killing fire-scorched chir pine trees and their control in Nahan Forest Division, Himachal Pradesh . Indian Forester 116:375-380.